对碘缺乏病的预防描述错误的是（）。

A.宣传多食用海产品，以预防碘缺乏病

B.在缺碘的地区，补碘半年即可

C.发展经济、普及教育、消除贫困

D.碘油通常用于难以推广碘盐的边远地区，可作为碘盐干预的辅助措施

E.食盐加碘可预防碘缺乏病

Alice has gone to the classroom and she didn’t say ________.

A．when did she come back

B．when would she be back

C．when she came back

D．when she would be back